Improvement in adjustable gear-wheels



@ciottoli tatrs atout @inline 4aid of a iixed toothed rim WILLIAM H. WARD, F AUBURN, NEW YORK.

Letters Patent No. 108,539, dated October 18, 1870.

`lliflPRQVEMENT IN ADJUSTABLE GEAR-WHEELS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom Iit may concern Be it known that l, WILLIAM 1I. Wann, of Auburn, in the county of' Cayuga and State of New York, have invented certainnew and useful Improvements in the Construction of` GearVhccls for Prcventing Back-Lash; and I do hereby declare that the following is a full7 clear, and exact description thereof', reference being had to the accompanying. drawing which makes part of this specification, and in which- Figure l represents an elevation of a double-rimmed toothed or gear-wheel, embracing my improvements, the teeth ot' one rim occupying the spaces of the other, for the purpose of' exposing only thc double-adjustable rims.

Figure 2 represents an elevation ol' the toothed don- -ble rims.

Figure 3 represents a diametrical section of the wheel.

Figure t represents an elevation ol'` the central or lixed part of the wheel.

Figure 5 represents a sectional view of `a portion of the wheel, showing one ofthe adjustable toothed rims removed from its seat.

Figure 6 represents an elevation of the same.

llo produce a cog-wheel that will not only admit of adjustment to compensate for the wear of the teeth, but will also prevent back-lash, is the object of my improvement, which consists in constructing a single wheel with two separate and distinct toothed rims, secured adjacent to each other upon the same fixed seat, to be adjusted thereon iu such manner that, while one of the rims will compensate for any wear in the teeth, the other, by a counter adjustment, will take up the back-lash ot' the gearing, however great, without the or wheel upon the same iixed seat. i 1

In the accompanying drawing- A represents the hub, B the arms, and (l U' the toothedor eogged rims of' the wheel.

The hub and arms are not, as heretofore, cast with the toothed rim of the wheel, butarc separate anddisfrom it, and made witha rim, F, that encircles the extremity ot' the arms, and constitutes a seat for the outer toothed rims. i

The circumference of' this seat is interrupted, so as to form recesses, a, therein.

rlhe part ofthe seat thus recessed is of a width equal to that of the rims, as shown in figs. 3, 5, and (i, so as to forni sides, D, to the recesses, to receive screw-bolts, f, or their equivalents, through each side of` said recessed portion of the rim, so that their points of' bearing will approach eac-h other. rlhepartV thus constructed constitutes the fixed member of the wheel, and is secured or keyed, in the usual manner, to the revolving shaft..

The cogged or toothed rims C C' constitute the adj ustablcn'iembers of the wheel, and their-inner concentric sin-face is of a diameter sufficient to allow thorn to he properly fitted upon the web or seat F ot' the fixed part of the wheel, as shown in o. 1.

The outer sides of these rims are .constructed with cogs, or teeth, c, in the usual manner, while their inner sides have projections, E, cf such form and size as to extend into each recess, and between the converging points of thc screws, in such manner that the latter will bear against the opposite sides of the projections E, and have sufficient space between their bearing points andthe sides of the recesses in the seat for the proper adjustment' of the coggcd rims.

'lhe cogged or toothed rims are fitted exactly alike upon their iixed seat, adjacent to Vcach other, so that they may he adjusted separately thereon. lu this particular, therefore, they not only differ from a toothed gear-wheel having a single rim adjustable, but from a split or double gear-wheel`havng a fixed and a movable toothed rim, as well as from a gearwhcel composed of three parts, viz., having an adjustable toothed wheel on either side of a fixed one, because thc fixed concentric scat, in myimprovcd wheel, renders a xcd toothed rim unnecessary. The teethl ot' the rims may he ofdiicrcnt lengths of face, whereone rim is used as a driver and the other to prevent backlash.

The twoadjustable rims, therefore, scrvcthe purpose of a lixed and al1 adjustable toothed rim on the salme wheel, and may be adjusted to bring their teeth out of coincidence, to compensate for the wear of the working-sides of the teeth, while at .the` same time, either of the said rims may he adjusted to take up any back-lash or lost motion ot` the gearing, because the adjustment of one of the toothed rims in one direction 'will compensate for the looseness caused by wear between the sides ofthe teeth, while a counter adjustnient ot' the other section of` the toothed rim will take up anylost motion throughout the gearing.

-The adjustable toothed rims C-C and the interior fixed part otl the wheel are held together by the bin'd-` ing hold or grip of the adjusting-screws which pass. through the recessed portions l) of the iixed seat F, and bear upon and against the opposite sides of the projections E of the adjustable arms G C', sc as te bite and clamp the said project-ions between them, while the angles of the sct-screwsf, with reference to the axis of the wheel, are such that one will bear hard obliqucly against one side of the projections, and the other will hear with like force from an oppositely-oblique direction, against thc other side cf the said projections E, and thus the parts are locked as firmly together though they were made in one and the same wheel.

Eaelrseetion of the rim` is provided with like pro-- jections E, and, as cach sect-ion is independent ofthe other, the set-screws are, therefore, arranged on each side of the fixed part of the wheel, solas to act upon the rims seliiarately.

While the screws thus lock the' parts of' the wheel 'tege-ther, they also constitute the means for adjusting tions, and, as therpart to which the: said set-screws are secured is fixed upon the shaft, it will be seen that the toothed rims must move either to the right or left upon their fixed seat, and thus effect-the required adjustment.- j

A Wheel thus constructed maybe fitted and work into ,intermediate gear-wheels of the ordinary construction, and, when adjusted, causeroi ary dies for rolling axles, dto., or cylinders for printing calicoes, wall-paper, &c., to revolve in perfect register, so that, whenever motion vis imparted to rone shaft or wheel, the adjacent wheels into which it matches m'ust respond'to it with rigid firmness and exaetn'ess, a desderatmn which itis ntterlyimpossihle to accomplish in producing such articles without the use of such an invention, because the slightest starting and stopping of the driving-wheel when any looseness exists inthe teeth of the gear-wheel, will instantly,impart an rregular motion to the dies, and cause the whole to rotate ont' `of order;y but with this improvement all must move in exact unison, and without any loosencss or jerking motion whatever, if properly adjusted.

' .Back-lash in gearing cannot be effeotually prevented by what is known as t-hc split or double gearwheel having a fixed' and an adjustable toothed rim;

nor by the arrangement of' two adjustable wheels on.'V

either side of a fixed wheel, because the fixed rim, while it serves its purpose nconnection with an adjustable rim or rims, to compensate for the wear ot1 the teeth of' each pair of' wheels, by diminishing the toothed rim, without the intervention of a fixed toothed rim, this is fully accomplished, and the wheel renderedniore simple and eiectiive, and cheaper in construction, as the teeth of' the two rims, side by side, may-'be adjusted.' to match with the teeth of the wheel which they drive until they are almost worn' ont. Moreover, a very `great advantage is obtained in thev use of these two adjustable toothed rims upon the same seat, in lcsseniug the width of' the toothed surface of' the wheel, and, consequently, the width of the wheels matching therein, and affords greatfacility for removal and replacement iu ease the teeth of one of' the rims should, from any cause, be broken.

Having thus described my invention,

The separate toot-hed rims, secured upon the same fixed scat, adjacent to each other, so that theymay be adjusted to cinnpensate for the wear of the teeth, and to prevent back-lash, without the aid-of a fixedl toothed rim or wheel upon the same seat, substantially as described.

' W. H. VARD.

Witnesses: l

J. N. STA'RIN, 'l. H. S. lowNn. 

